[1ChCl:2EG]/CrCl_3?6H_2O低共熔溶剂的物化性质

Physico-chemical Properties of [1ChCl:2EG]/CrCl_3?6H_2O Deep Eutectic Solvents

实验研究了低共熔溶剂[1Ch Cl:2EG]/Cr Cl3?6H2O的熔点、密度、表面张力、粘度和电导率与Cr Cl3?6H2O浓度和温度的关系.结果表明,[1Ch Cl:2EG]/Cr Cl3?6H2O的最低共熔点为211 K,具有较宽的低温液程;密度与温度呈良好的线性关系并随Cr Cl3·6H2O浓度升高略微增大;表面张力比水小但比传统的有机溶剂高,并随Cr Cl3?6H2O浓度升高而略微增大;温度从293 K升高到343 K,[1Ch Cl:2EG]/Cr Cl3?6H2O的粘度显著降低,而电导率则明显增大,Cr Cl3?6H2O浓度为0.3 mol/L时,该溶剂体系粘度最小,电导率最高;Cr Cl3?6H2O和[1Ch Cl:2EG]/(0.3 mol/L)Cr Cl3?6H2O在923 K下分解后产物都是CRO3;1Ch Cl:2EG和[1Ch Cl:2EG]/(0.3 mol/L)Cr Cl3?6H2O均可在383 K内保持稳定.

The melting points, density, surface tension, viscosity and conductivity of [1ChCl：2EG]/CrCl3·6H2O deep eutectic solvents（DESs） ionic liquids as a function of temperatures and concentration of Cr Cl3·6H2O had been studied, respectively. The results showed that [1ChCl：2EG]/CrCl3·6H2O DESs have the lowest melting points（211 K）, indicating it has wider liquid range at low temperature. It shows a good linear relationship between the density and temperature, with the temperature increasing, the density increased slightly. The surface tension lower than water but higher than traditional organic solvent and increases with the concentration of the Cr Cl3·6H2O. As temperature increases from 293 K to 343 K, the viscosity of [1ChCl：2EG]/CrCl3·6H2O DESs decreases significantly, but the conductivity increases obviously, and the DESs have the minimum viscosity and the maximum conductivity at the concentration of 0.3 mol/L Cr Cl3·6H2O. The Cr Cl3·6H2O and [1Ch Cl：2EG]/（0.3 mol/L） Cr Cl3·6H2O DES were decomposed into CRO3 at 923 K, and could maintain stable performance below 383 K.